|
| 1 | +/* |
| 2 | + const obj1 = {a: 4, b: 5}; |
| 3 | + const obj2 = {a: 3, b: 5}; |
| 4 | + const obj3 = {a: 4, c: 5}; |
| 5 | +
|
| 6 | + diff(obj1, obj2); |
| 7 | + [ |
| 8 | + { "op": "replace", "path": ['a'], "value": 3 } |
| 9 | + ] |
| 10 | +
|
| 11 | + diff(obj2, obj3); |
| 12 | + [ |
| 13 | + { "op": "remove", "path": ['b'] }, |
| 14 | + { "op": "replace", "path": ['a'], "value": 4 } |
| 15 | + { "op": "add", "path": ['c'], "value": 5 } |
| 16 | + ] |
| 17 | +
|
| 18 | + // using converter to generate jsPatch standard paths |
| 19 | + // see http://jsonpatch.com |
| 20 | + import {diff, jsonPatchPathConverter} from 'just-diff' |
| 21 | + diff(obj1, obj2, jsonPatchPathConverter); |
| 22 | + [ |
| 23 | + { "op": "replace", "path": '/a', "value": 3 } |
| 24 | + ] |
| 25 | +
|
| 26 | + diff(obj2, obj3, jsonPatchPathConverter); |
| 27 | + [ |
| 28 | + { "op": "remove", "path": '/b' }, |
| 29 | + { "op": "replace", "path": '/a', "value": 4 } |
| 30 | + { "op": "add", "path": '/c', "value": 5 } |
| 31 | + ] |
| 32 | +
|
| 33 | + // arrays |
| 34 | + const obj4 = {a: 4, b: [1, 2, 3]}; |
| 35 | + const obj5 = {a: 3, b: [1, 2, 4]}; |
| 36 | + const obj6 = {a: 3, b: [1, 2, 4, 5]}; |
| 37 | +
|
| 38 | + diff(obj4, obj5); |
| 39 | + [ |
| 40 | + { "op": "replace", "path": ['a'], "value": 3 } |
| 41 | + { "op": "replace", "path": ['b', 2], "value": 4 } |
| 42 | + ] |
| 43 | +
|
| 44 | + diff(obj5, obj6); |
| 45 | + [ |
| 46 | + { "op": "add", "path": ['b', 3], "value": 5 } |
| 47 | + ] |
| 48 | +
|
| 49 | + // nested paths |
| 50 | + const obj7 = {a: 4, b: {c: 3}}; |
| 51 | + const obj8 = {a: 4, b: {c: 4}}; |
| 52 | + const obj9 = {a: 5, b: {d: 4}}; |
| 53 | +
|
| 54 | + diff(obj7, obj8); |
| 55 | + [ |
| 56 | + { "op": "replace", "path": ['b', 'c'], "value": 4 } |
| 57 | + ] |
| 58 | +
|
| 59 | + diff(obj8, obj9); |
| 60 | + [ |
| 61 | + { "op": "replace", "path": ['a'], "value": 5 } |
| 62 | + { "op": "remove", "path": ['b', 'c']} |
| 63 | + { "op": "add", "path": ['b', 'd'], "value": 4 } |
| 64 | + ] |
| 65 | +*/ |
| 66 | + |
| 67 | +function diff(obj1, obj2, pathConverter) { |
| 68 | + if (!obj1 || typeof obj1 != 'object' || !obj2 || typeof obj2 != 'object') { |
| 69 | + throw new Error('both arguments must be objects or arrays'); |
| 70 | + } |
| 71 | + |
| 72 | + pathConverter || |
| 73 | + (pathConverter = function(arr) { |
| 74 | + return arr; |
| 75 | + }); |
| 76 | + |
| 77 | + function getDiff(obj1, obj2, basePath, diffs) { |
| 78 | + var obj1Keys = Object.keys(obj1); |
| 79 | + var obj1KeysLength = obj1Keys.length; |
| 80 | + var obj2Keys = Object.keys(obj2); |
| 81 | + var obj2KeysLength = obj2Keys.length; |
| 82 | + var path; |
| 83 | + |
| 84 | + for (var i = 0; i < obj1KeysLength; i++) { |
| 85 | + var key = Array.isArray(obj1) ? Number(obj1Keys[i]) : obj1Keys[i]; |
| 86 | + if (!(key in obj2)) { |
| 87 | + path = basePath.concat(key); |
| 88 | + diffs.remove.push({ |
| 89 | + op: 'remove', |
| 90 | + path: pathConverter(path), |
| 91 | + }); |
| 92 | + } |
| 93 | + } |
| 94 | + |
| 95 | + for (var i = 0; i < obj2KeysLength; i++) { |
| 96 | + var key = Array.isArray(obj2) ? Number(obj2Keys[i]) : obj2Keys[i]; |
| 97 | + var obj1AtKey = obj1[key]; |
| 98 | + var obj2AtKey = obj2[key]; |
| 99 | + if (!(key in obj1)) { |
| 100 | + path = basePath.concat(key); |
| 101 | + var obj2Value = obj2[key]; |
| 102 | + diffs.add.push({ |
| 103 | + op: 'add', |
| 104 | + path: pathConverter(path), |
| 105 | + value: obj2Value, |
| 106 | + }); |
| 107 | + } else if (obj1AtKey !== obj2AtKey) { |
| 108 | + if ( |
| 109 | + Object(obj1AtKey) !== obj1AtKey || |
| 110 | + Object(obj2AtKey) !== obj2AtKey |
| 111 | + ) { |
| 112 | + path = pushReplace(path, basePath, key, diffs, pathConverter, obj2); |
| 113 | + } else { |
| 114 | + if ( |
| 115 | + !Object.keys(obj1AtKey).length && |
| 116 | + !Object.keys(obj2AtKey).length && |
| 117 | + String(obj1AtKey) != String(obj2AtKey) |
| 118 | + ) { |
| 119 | + path = pushReplace(path, basePath, key, diffs, pathConverter, obj2); |
| 120 | + } else { |
| 121 | + getDiff(obj1[key], obj2[key], basePath.concat(key), diffs); |
| 122 | + } |
| 123 | + } |
| 124 | + } |
| 125 | + } |
| 126 | + |
| 127 | + return diffs.remove.reverse().concat(diffs.replace).concat(diffs.add); |
| 128 | + } |
| 129 | + return getDiff(obj1, obj2, [], {remove: [], replace: [], add: []}); |
| 130 | +} |
| 131 | + |
| 132 | +function pushReplace(path, basePath, key, diffs, pathConverter, obj2) { |
| 133 | + path = basePath.concat(key); |
| 134 | + diffs.replace.push({ |
| 135 | + op: 'replace', |
| 136 | + path: pathConverter(path), |
| 137 | + value: obj2[key], |
| 138 | + }); |
| 139 | + return path; |
| 140 | +} |
| 141 | + |
| 142 | +function jsonPatchPathConverter(arrayPath) { |
| 143 | + return [''].concat(arrayPath).join('/'); |
| 144 | +} |
| 145 | + |
| 146 | +export {diff, jsonPatchPathConverter}; |
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